General Info:

Dexamethasone (Decadron), a corticosteroid drug, is used to reduce inflammation and relieve symptoms in a variety of disorders, including rheumatoid arthritis and severe cases of asthma. It may be given to people to treat primary or secondary adrenal cortex insufficiency (lack of sufficient adrenal hormone). It is also given to help treat the following disorders:

Severe allergic conditions such as drug-induced allergies
Blood disorders such as various anemias
Certain cancers (along with other drugs)
Collagen (connective tissue) diseases such as systemic lupus erythematosus
Digestive tract disease such as ulcerative colitis
High serum levels of calcium associated with cancer
Fluid retention due to nephrotic syndrome (a condition in which damage to the kidneys causes the body to lose protein in the urine)
Eye diseases such as allergic conjunctivitis
Lung diseases such as tuberculosis (along with other drugs)

Dexamethasone (Decadron) lowers your resistance to infections and can make them harder to treat. Dexamethasone (Decadron) may also mask some of the signs of an infection, making it difficult for your doctor to diagnose the actual problem.